A. P. Kovshik

St Petersburg University

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E. I. Ryumtsev

St Petersburg University

A. A. Karetnikov

St Petersburg University

L. A. Dobrun

St Petersburg University

E. V. Aksenova

St Petersburg University

Yu. G. Galyametdinov

Kazan E. K. Zavoisky Physical-Technical Institute

A. A. Knyazev

Kazan State Technological University

E. I. Rjumtsev

St Petersburg University

N. A. Karetnikov

ITMO University

V. P. Romanov

St Petersburg University

СГ

С. Г. Полушин

St Petersburg University

Cooperative Institutions

St Petersburg University

Institute of Physics

Russian Academy of Sciences

Institute of Macromolecular Compounds

Lomonosov Moscow State University

State Optical Institute named after SI Vavilov

Argonne National Laboratory

Euclid Techlabs (United States)

TechLab (United States)

ITMO University

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The anisotropic properties of a terbium-based liquid crystal complex

Nanosystems Physics Chemistry Mathematics (2016)

L. A. Dobrun Aleksandr S. Sakhatskii A. P. Kovshik E. I. Ryumtsev W. Haase

The dielectric properties of a paramagnetic terbium-containing liquid crystal have been studied.The magnitude and the sign of the dielectric of the liquid crystalline complex have been determined.The relaxation processes (modes) characterizing the dispersion of the principal values of the sample's dielectric permittivity has been studied.The relaxation times, activation energy and the dipole moment of the complex could be evaluated.

Terbium

10.17586/2220-8054-2016-7-6-911-918

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Citations (1)

Dielectric Relaxation in Liquid Crystals with (CH₂) Spacers in Molecules

Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals (1999)

E. I. Rjumtsev A. P. Kovshik D. A. Ragimov

Abstract The dielectric properties of solutions of the liquid crystals with (CH2) spacers and nitrile groups in molecules in weakly polar nematic diluent were studied. In the frequency range of a.c. electric field (102−108)Hz the dispersion of complex dielectric permitivities ε| in nematic phase were investigated. From the dielectric spectra of ε|, the relaxation frequencies fRwere obtained for each of the investigated substances. It was shown that fR increases with the (CH2) spacers length of the central alkyl chains of molecules. Key Words: dielectric dispersionliquid crystalsspacers

10.1080/10587259908047506

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Citations (2)

Electro-Optical Response of Cells with Homeoplanar Layers of a Nematic Liquid Crystal with Different Thicknesses at Oblique Incidence of Light

Optics and Spectroscopy (2021)

A. A. Karetnikov A. P. Kovshik N. A. Karetnikov E. I. Ryumtsev E. V. Aksenova

Reflection

Light beam

10.1134/s0030400x21020065

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Citations (2)

Fast-response electrooptic liquid-crystal prism modulator

Journal of Optical Technology (1994)

A. A. Karetnikov A. P. Onokhov M. V. Isaev L. A. Beresnev A. P. Kovshik

Prism

Electro-optic modulator

Modulation (music)

Crystal (programming language)

Source

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New method of determination of the tilt angle at a liquid crystal-glass interface

arXiv (Cornell University) (2009)

A. A. Karetnikov N. A. Karetnikov A. P. Kovshik Y. I. Rjumtsev

We propose a polarimetric method for measuring the tilt angle of the LC director at an LC layer interface.The method involves the use of an LC cell operating in the mode of the total internal reflection of the ordinary wave. The method is based on measuring the angle of the plane of light incidence on the cell with the polarization vector of the extraordinary wave passed through the cell or with the polarization vector of the ordinary wave reflected from the cell. To calculate the tilt angle, the polarization azimuth of the light incident on the cell, which induces only the ordinary wave, can be also used.The method is applicable throughout the whole range of the LC director tilt angles.

Normal

Reflection

Brewster's angle

10.48550/arxiv.0910.2162

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Citations (2)

Thermodynamic and Optical Properties of Mixtures Based on Mesogenic Dysprosium (III) Complex and Nematic Liquid Crystal

Liquid Crystals and their Application (2021)

M. E. Karyakin A. P. Kovshik Aleksandr S. Krupin L. A. Dobrun A. A. Knyazev

М. Е. Карякин1 , А. П. Ковшик 2 , А. С. Крупин 1 , Л. А. Добрун 2 , А. А. Князев 1 , Ю. Г. Галяметдинов 1, 3 ТЕРМОДИНАМИЧЕСКИЕ И ОПТИЧЕСКИЕ СВОЙСТВА СМЕСЕЙ НА ОСНОВЕ МЕЗОГЕННОГО КОМПЛЕКСА ДИСПРОЗИЯ (III) И НЕМАТИЧЕСКОГО ЖИДКОГО КРИСТАЛЛА 1 Казанский национальный исследовательский

Mesogen

Dysprosium

10.18083/lcappl.2021.2.45

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Dielectric and magnetic anisotropy of a nematic ytterbium complex

Journal of Experimental and Theoretical Physics (2015)

L. A. Dobrun Aleksandr S. Sakhatskii A. P. Kovshik E. I. Ryumtsev I. P. Kolomiets

Ytterbium

Solid-state physics

10.1134/s106377611505012x

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Citations (6)

Linear Prism Liquid-Crystal Polarizer

A. A. Karetnikov A. P. Kovshik

Abstract A linear prism polarizers, based on oriented nematic liquid crystal layers, are considered. The operational parameters are given.

Polarizer

Prism

10.1080/10587259508033614

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Citations (4)

Electrooptical properties of solutions and the polarity of liquid-crystal fluorene molecules

Optics and Spectroscopy (1993)

E. I. Ryumtsev A. P. Kovshik N. P. Evlampieva G. Kossmel Michael Schulz

Polarity (international relations)

Source

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Preliminary Communication Dielectric relaxation in monotropic liquid crystals

Liquid Crystals (1995)

E. I. Rjumstev A. P. Kovshik

Abstract A way of investigating dielectric relaxation phenomena occurring in the isotropic and liquid crystalline states by the use of monotropic mesogens is suggested. The application of common methods of dielectric spectroscopy in the radio frequency range (102-108Hz) to strongly supercooled samples for the investigation of the amorphous liquid and low temperature monotropic liquid crystalline states is described. The possibility of experimental separation and investigation of the different dipole polarization mechanisms responsible for the dielectric properties of the monotropic mesogen 4-cyano-3-chlorophenyl 4-hexyl-3-chlorobiphenyl-4′-carboxylate (CChEC), whose molecules have longitudinal and normal permanent dipole moment components, is established.

Mesogen

Supercooling

10.1080/02678299508036695

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Citations (2)